Creatures' Spell power

[Appled]

Good day there sir.

I have been doing my ''funserver'' lately and it has slightly better levelcap than blizzlike. I have been scripting some custom dungeons there. But as you have more HP, the normal spells are not doing enough damage. So I am wondering is creature's spell power/spell damage modifyable?
And I think all NPC/creature spells scales with spell power, at least they should.